#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of OpenDrift.
#
# OpenDrift is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 2
#
# OpenDrift is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with OpenDrift.  If not, see <https://www.gnu.org/licenses/>.
#
# Copyright 2015, Knut-Frode Dagestad, MET Norway

import unittest
from datetime import datetime, timedelta
import numpy as np
import pyproj

from opendrift.readers import reader_global_landmask
from opendrift.readers import reader_ArtificialOceanEddy
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.readers import reader_constant
from opendrift.models.plastdrift import PlastDrift
from opendrift.models.oceandrift import OceanDrift
from opendrift.models.openoil import OpenOil
from opendrift.models.windblow import WindBlow
from opendrift.models.shipdrift import ShipDrift
from opendrift.models.larvalfish import LarvalFish

import opendrift
print(opendrift.versions())
tdf = opendrift.test_data_folder

class TestModels(unittest.TestCase):
    """Tests for OpenDrift models"""

    def test_wind_and_current_drift_factor(self):
        lat=60
        lon=4
        o = OceanDrift(loglevel=50)
        o.set_config('general:use_auto_landmask', False)
        o.set_config('environment:constant:land_binary_mask', 0)
        o.set_config('environment:constant:x_wind', 5)
        o.set_config('environment:constant:y_sea_water_velocity', 1)
        o.seed_elements(lon=lon, lat=lat, time=datetime.now(), wind_drift_factor=0, current_drift_factor=1)
        o.run(duration=timedelta(hours=2))
        o2 = OceanDrift()
        o2.set_config('general:use_auto_landmask', False)
        o2.set_config('environment:constant:land_binary_mask', 0)
        o2.set_config('environment:constant:x_wind', 5)
        o2.set_config('environment:constant:y_sea_water_velocity', 1)
        o2.seed_elements(lon=lon, lat=lat, time=datetime.now(), wind_drift_factor=0.02, current_drift_factor=.3)
        o2.run(duration=timedelta(hours=2))
        self.assertAlmostEqual(o.elements.lat[0], lat + 0.0646, 3)
        self.assertAlmostEqual(o.elements.lon[0], lon)
        self.assertAlmostEqual(o2.elements.lat[0], lat + 0.0646*.3, 3)
        self.assertAlmostEqual(o2.elements.lon[0], lon + 0.0129, 3)

    def test_windblow(self):
        o = WindBlow(loglevel=30)
        reader_arome = reader_netCDF_CF_generic.Reader(tdf + '2Feb2016_Nordic_sigma_3d/AROME_MetCoOp_00_DEF_20160202_subset.nc')
        o.add_reader([reader_arome])
        lat = 67.711251; lon = 13.556971  # Lofoten
        o.seed_elements(lon, lat, radius=5000, number=1000,
                        time=reader_arome.start_time)
        o.run(steps=24, time_step=3600)
        self.assertAlmostEqual(o.elements.lon.max(), 15.864, 2)

    def test_shipdrift(self):
        """Sintef case study"""
        s = ShipDrift(loglevel=50)
        s.set_config('drift:horizontal_diffusivity', 0)
        c = reader_constant.Reader({
            'sea_surface_wave_significant_height': 5,
            'sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment': 11,
            'x_wind': 14.14213562,
            'y_wind': -14.14213562,
            'x_sea_water_velocity': 0.05656854249,
            'y_sea_water_velocity': -0.05656854249})
        s.set_config('environment:fallback:land_binary_mask', 0)
        s.add_reader(c)
        s.list_configspec('seed')
        s.set_config('seed:orientation', 'left')
        s.seed_elements(lon=2, lat=60, time=datetime.now(), number=3,
                        length=80, beam=14, height=25, draft=5)
        s.run(time_step=600, duration=timedelta(hours=4))
        self.assertIsNone(np.testing.assert_array_almost_equal(
            s.elements.lon, 2.254, 3))
        self.assertIsNone(np.testing.assert_array_almost_equal(
            s.elements.lat, 59.873, 3))

    def test_shipdrift_defaults(self):
        s = ShipDrift(loglevel=0)
        #s.list_configspec()
        s.set_config('environment:fallback:land_binary_mask', 0)
        c = reader_constant.Reader({
            'sea_surface_wave_significant_height': 5,
            'sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment': 11,
            'x_wind': 14.14213562,
            'y_wind': -14.14213562,
            'x_sea_water_velocity': 0.05656854249,
            'y_sea_water_velocity': -0.05656854249})
        s.add_reader(c)
        s.set_config('seed:height', 14)
        s.seed_elements(lon=2, lat=60, time=datetime.now(), number=1)
        s.run(duration=timedelta(hours=4))
        self.assertAlmostEqual(s.elements.lon.max(), 2.267, 2)

    def test_shipdrift_backwards(self):
        """Case above, reversed"""
        s = ShipDrift(loglevel=50)
        c = reader_constant.Reader({
            'sea_surface_wave_significant_height': 5,
            'sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment': 11,
            'x_wind': 14.14213562,
            'y_wind': -14.14213562,
            'x_sea_water_velocity': 0.05656854249,
            'y_sea_water_velocity': -0.05656854249})
        s.set_config('environment:fallback:land_binary_mask', 0)
        s.set_config('drift:horizontal_diffusivity', 0)
        s.add_reader(c)
        s.seed_elements(lon=2.254, lat=59.873,
                        time=datetime.now(), number=1,
                        length=80, beam=14, height=25, draft=5)
        s.run(time_step=-600, duration=timedelta(hours=4))
        self.assertIsNone(np.testing.assert_array_almost_equal(
                s.elements.lon, 2.0, 3))
        self.assertIsNone(np.testing.assert_array_almost_equal(
                s.elements.lat, 60, 3))

    def test_wind_drift_shear(self):
        """Testing PlastDrift model, with wind-induced current shear"""
        o = PlastDrift(loglevel=30)
        o.set_config('environment:fallback:x_wind',  10)
        o.set_config('environment:fallback:y_wind', 0)
        o.set_config('environment:fallback:land_binary_mask', 0)
        o.seed_elements(lat=60, lon=5, time=datetime.now(),
                        number=3,
                        z = np.array([0, -0.05, -.1]))
        o.run(duration=timedelta(hours=10))
        self.assertIsNone(np.testing.assert_array_almost_equal(
                            o.elements.lon,
                          [5.010873, 5.016866, 5.009735]))
        self.assertAlmostEqual(o.elements.lat[0], o.elements.lat[2], 3)


    def test_larvalfish(self):
        o = LarvalFish()
        # Tests to be added

if __name__ == '__main__':
    unittest.main()
